#41 Bugfixing : unbinding texture image units

- still not working, , disabled vsync again
- read only / write only fixes, coherent across shaders and application
- "fix" for clear voxel grid bug on laptop, but via glTexSubImage2D
#26 Buttons / Sliders : Quad Object

- added query method for a Quad Object to resource manager
- also has UV Coords
- UNTESTED yet